reproduce (this is a W=1 build):
        git checkout 76db4c64526c5e8ba0f56ad3d890dce8f9b00bbc
        b4 shazam https://lore.kernel.org/r/20240621-scmi-mailbox-v1-v1-2-8ed450735f46@nxp.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/firmware/arm_scmi/